Help on how to create a hologram with particles
You want the particles to travel upwards. Set the particles Field Weight for gravity to 0.0. Add a force field at the location of suzanne with a negative strength, or you could assign the force field settings to the model itself. Setting the shape to plane seems to worked best.
To make them move slower, increase the mass for the particles.
To make them disappear as they pass suzanne. You can enable collision for the object with kill particles enabled. Also adjust the lifetime so that the longest lived particles finish just above the object.
You want the particles to emit from a small area. Here you have a couple of options, one is to add a small object at the point to emit the particles. Another option that I used, is to assign some vertices (or a single vertex) from the object at the location of emission to a vertex group that you then select in the particles vertex groups for density. I also shaped the verts into a small pyramid to get the particles to spread outwards a bit more, a little random velocity also helped with that.


Here is a sample file